BGP本地优先属性详解配置.docx

Local-pre属性（默认100）?BGP路由器通过不同的IBGP得到达到目的地址的多条路径，通过Local-pre属性的调整控制流量方向。(环路可能产生AS—Path可避免)全局调整—调整全部经过的流量Default local-preference 200(BGP进程中)局部调整—调整特定的流量?拓扑：???实验目的：局部调整,r1到192.168.1.100的路由路径的改变.?配置：r1r1dis?current-configuration?#sysname?r1#interface?Serial0/0/1?link-protocol?ppp?undo?shutdown?ip?address?202.1.1.1?255.255.255.252#interface?Serial0/0/2?link-protocol?ppp?undo?shutdown?ip?address?202.1.1.5?255.255.255.252#interface?LoopBack0?ip?address?1.1.1.1?255.255.255.255#interface?LoopBack100#bgp?100?router-id?1.1.1.1?peer?2.2.2.2?as-number?100?peer?2.2.2.2?connect-interface?LoopBack0?peer?3.3.3.3?as-number?100?peer?3.3.3.3?connect-interface?LoopBack0?#?ipv4-family?unicast??undo?synchronization??import-route?ospf?1??peer?2.2.2.2?enable??peer?2.2.2.2?route-policy?loca-pre?import??peer?3.3.3.3?enable#ospf?1?import-route?bgp?area?0.0.0.0??network?1.1.1.1?0.0.0.0??network?202.1.1.0?0.0.0.3??network?202.1.1.4?0.0.0.3#route-policy?loca-pre?permit?node?10?if-match?ip-prefix?loca-pre?apply?local-preference?200#route-policy?loca-pre?permit?node?20#ip?ip-prefix?loca-pre?index?10?permit?192.168.1.100?32#user-interface?con?0user-interface?vty?0?4user-interface?vty?16?20#?r2r2dis?current-configuration?#sysname?r2#interface?Serial0/0/0?link-protocol?ppp?undo?shutdown?ip?address?202.1.1.9?255.255.255.252#interface?Serial0/0/1?link-protocol?ppp?undo?shutdown?ip?address?202.1.1.2?255.255.255.252#interface?LoopBack0?ip?address?2.2.2.2?255.255.255.255#interface?LoopBack100#bgp?100?peer?1.1.1.1?as-number?100?peer?1.1.1.1?connect-interface?LoopBack0?peer?3.3.3.3?as-number?100?peer?3.3.3.3?connect-interface?LoopBack0?#?ipv4-family?unicast??undo?synchronization??import-route?ospf?1??peer?1.1.1.1?enable??peer?3.3.3.3?enable#ospf?1?import-route?bgp?area?0.0.0.0??network?2.2.2.2?0.0.0.0??network?202.1.1.0?0.0.0.3??network?202.1.1.8?0.0.0.3??network?192.168.1.1?0.0.0.0??network?192.168.1.100?0.0.0.0#r2??r3r3dis?current-configuration#sysname?r3#interface?Serial0/0/0?link-protocol?ppp?undo?shut